Type SCHOOLAIR-B

Supply and extract air unit with heat exchanger and heat recovery, secondary air option, for installation under the sill

Ready-to-operate decentralised ventilation unit that provides good comfort levels, used for the ventilation and extract ventilation of rooms such as classrooms in schools

  • Acoustically optimised EC fans with low specific fan powers, SFP-1 according to EN 13779
  • Plate heat exchanger for heat recovery (air/air), including bypass with electric actuator
  • Highly efficient heat exchanger for heating and cooling as 2-pipe or 4-pipe system
  • Heat recovery all year round
  • Reduction of fine dust and pollen contamination due to integral filters that conform to VDI 6022 – F7 fresh air filter and G3 extract air filter
  • Easy filter change, no tools required
  • Condensate drip tray with condensate drain
  • Motorised shut-off dampers, normally closed (NC)
  • Installation without interruption to the operations of the respective school


Optional equipment and accessories

  • Modular control system FSL-CONTROL II, specially for decentralised ventilation systems
  • Demand-based fresh air volume, free cooling and night purge, depending on control strategy
  • Various fixing systems to fix the unit to the floor or wall
  • Variable heat recovery
  • Powder-coated RAL 9005 (black)

SCHOOLAIR-B-HE 00255533_0


  • Application
  • Description

Application

  • Ventilation and extract ventilation of rooms with a depth up to approx. 6 m
  • 2-pipe or 4-pipe heat exchangers enable good comfort levels
  • Inducing displacement flow
  • Energy-efficient solution since water is used for heating and cooling
  • For new buildings, refurbishment projects and revitalisation projects
  • Installation under the sill
  • Typical applications include classrooms in schools, playrooms in daycare facilities, meeting rooms and offices with a high air change rate

Special characteristics

  • Decentralised ventilation unit for high volume flow rates
  • Motorised shut-off dampers for fresh air and exhaust air, normally closed (NC) in order to prevent uncontrolled airflows and the carry over of smoke
  • Demand-based ventilation and extract ventilation is possible by means of monitoring the room air quality and with dedicated control equipment
  • For demand-based ventilation
  • Recuperative heat recovery with motorised variable bypass all year round
  • Heat exchanger as 2-pipe or 4-pipe system, with G½" union nuts and flat seals
  • Meets the hygiene requirements of VDI 6022
  • Filter class: F7 for fresh air, G3 for extract air
  • Easy filter change with quick release fasteners, no tools required
  • Condensate drip tray with condensate drain
  • Compact construction, hence particularly suitable for refurbishment projects

Nominal sizes

  • SCHOOLAIR-B: 1590 × 650 × 420 mm (B × H × T)
  • SCHOOLAIR-B-HE: 2090 × 750 × 420 mm (B × H × T)

Variants

  • SCHOOLAIR-B – volume flow rates: 150, 200, 250 and 320 m³/h, with cross flow plate heat exchanger for heat recovery
  • SCHOOLAIR-B-HE – volume flow rates: 200, 250, 300 and 400 m³/h, with cross counter flow plate heat exchanger for heat recovery

Construction

  • Powder-coated RAL 9005, black

Accessories

  • Outer casing made of wood, with integral supply air and extract air grilles

Useful additions

  • Modular control system FSL-CONTROL II, specially for decentralised ventilation systems
  • Connecting hoses

Construction features

  • 2 energy-efficient EC fans with low specific fan powers, SFP = 1 according to EN 13779
  • Fresh air flow rate up to 400 m³/h, depending on construction variant
  • Cross flow or counter flow plate heat exchanger
  • Motorised shut-off dampers for fresh air and exhaust air, normally closed (NC) in order to prevent uncontrolled airflows and the carry over of smoke
  • The supply air is discharged to the room as an inducing displacement flow from the lower front part of the unit
  • Extract air is taken in to the upper part of the unit

Materials and surfaces

  • Casing, filter chamber cover, fans and levelling feet are made of galvanised sheet steel
  • Heat exchanger with copper tubes and aluminium fins
  • Plate heat exchanger (heat recovery) made of aluminium
  • Casing powder-coated, black (RAL 9005)
  • F7 filter medium made of moisture-resistant glass fibre paper (certified by Eurovent)
  • Mineral wool lining to DIN 4102, fire rating class A, faced with glass fibre fabric as a protection against erosion, effective with airflow velocities up to 20 m/s
  • Closed cell sealing strips

Standards and guidelines

  • Façade ventilation units of Type SCHOOLAIR-B conform to VDI 6035 and VDMA 24390
  • Hygiene certificate to VDI 6022
  • Heating/cooling fluid conforms to VDI 2035
  • Meets the requirements of EU directive 1253/2014 (ErP).

Maintenance

  • VDI 6022, Part 1, applies (Hygiene requirements for ventilation and air-conditioning systems and units)
  • The heat exchanger can be vacuumed with an industrial vacuum cleaner if necessary
  • It can also be cleaned with commercial, non-aggressive cleaning agents

Technical information

Function, Technical data, Quick sizing, Specification text, Order code, Related products

  • Function
  • Technical data
  • Quick sizing
  • Specification text
  • Order code

Functional description

Decentralised supply and extract air units for room ventilation and for dissipating cooling loads and heat loads.

An EC centrifugal fan takes in the fresh air which then flows through the motorised shut-off damper and the F7 filter.

Once the fresh air has passed the fan, it flows through the recuperative heat exchanger for heat recovery; it is possible to bypass the recuperative heat exchanger when it is sensible with regard to energy efficiency.

If necessary, the air is heated or cooled by the heat exchanger before it is discharged to the room as a displacement flow.

The extract air first passes a G3 filter (that protects the unit), then flows through the heat exchanger (for heat recovery), the extract air fan and the motorised shut-off damper before it is discharged to the outside as exhaust air.

If the room air quality is good, the unit can be operated in secondary mode only.

Width

1590 mm SCHOOLAIR-B, 2090 mm SCHOOLAIR-B-HE

Height

650 mm SCHOOLAIR-B, 750 mm SCHOOLAIR-B-HE

Depth

420 mm

Volume flow rate

150, 200, 250 m³/h (boost: 320 m³/h) with SCHOOLAIR-B

Volume flow rate

150, 225, 300 m³/h (boost: 400 m³/h) with SCHOOLAIR-B-HE

Cooling capacity

Up to 1750 W

Heating capacity

Up to 6500 W

Room cooling capacity

Up to 1000 W

Room heating capacity

Up to 1700 W

Sound power level

32 – 49 dB(A) (depending on variant)

Max. operating pressure, water side

6 bar

Max. operating temperature

75 °C

Supply voltage

230 V AC ±10%; 50/60 Hz

Weight

70 kg (SCHOOLAIR-B), 125 kg (SCHOOLAIR-B-HE)


SCHOOLAIR-B (sizing examples)

Supply air flow rate

m³/h

150

200

250

320

Fresh air flow rate

m³/h

150

200

250

320

Total cooling capacity

W

687

913

1130

1390

Room cooling capacity

W

401

534

668

791

Temperature of the air in the unit

°C

32

32

32

32

Rel. humidity

%

40

40

40

40

Water content of the dry air

g/kg

11.9

11.9

11.9

11.9

Supply air temperature

°C

18

18

18

18.6

Condensation

g/h

0

0

0

0

Chilled water flow rate

l/h

90

150

220

250

Water temperature, inlet

°C

16

16

16

16

Water temperature, outlet

°C

22.6

21.2

20.4

20.8

Pressure drop – water side

kPa

<3

<3

<3

<5

Total heating capacity

W

2910

3780

4660

5810

Room heating capacity

W

972

1202

1445

1721

Temperature of the air in the unit

°C

–12

–12

–12

–12

Supply air temperature

°C

39.4

38.0

37.3

36.1

Hot water flow rate

l/h

70

100

140

200

Water temperature, inlet

°C

60

60

60

60

Water temperature, outlet

°C

24

27.3

31.2

34.8

Pressure drop – water side

kPa

<3

<3

<3

<5

Sound power level LWA

dB(A)

29

34

38

43

Sound pressure level with 8 dB system attenuation

dB(A)

21

26

30

35


SCHOOLAIR-B-HE (sizing examples)

Supply air flow rate

m³/h

150

225

300

400

Heating capacity (without heat recovery)

W

2920

4060

5310

6530

Internal heating capacity

W

927

1105

1383

1363

Temperature of the air in the unit

°C

-12

-12

-12

-12

Supply air temperature

°C

39.5

35.7

34.8

31.2

Hot water flow rate

l/h

80

120

200

250

Water temperature, inlet

°C

60

60

60

60

Water temperature, outlet

°C

28.4

30.7

37.0

37.3

Pressure drop – water side

kPa

<3

<4

<15

<22

Sound power level LWA

dB(A)

33

40

44

49

Sound pressure level with 8 dB system attenuation

dB(A)

25

32

36

41



Decentralised ventilation unit with supply and extract air function, with heat exchanger and heat recovery, secondary air option (based on air quality), for installation under a sill.

Special characteristics

  • Decentralised ventilation unit for high volume flow rates
  • Motorised shut-off dampers for fresh air and exhaust air, normally closed (NC) in order to prevent uncontrolled airflows and the carry over of smoke
  • Demand-based ventilation and extract ventilation is possible by means of monitoring the room air quality and with dedicated control equipment
  • For demand-based ventilation
  • Recuperative heat recovery with motorised variable bypass all year round
  • Heat exchanger as 2-pipe or 4-pipe system, with G½" union nuts and flat seals
  • Meets the hygiene requirements of VDI 6022
  • Filter class: F7 for fresh air, G3 for extract air
  • Easy filter change with quick release fasteners, no tools required
  • Condensate drip tray with condensate drain
  • Compact construction, hence particularly suitable for refurbishment projects

Materials and surfaces

  • Casing, filter chamber cover, fans and levelling feet are made of galvanised sheet steel
  • Heat exchanger with copper tubes and aluminium fins
  • Plate heat exchanger (heat recovery) made of aluminium
  • Casing powder-coated, black (RAL 9005)
  • F7 filter medium made of moisture-resistant glass fibre paper (certified by Eurovent)
  • Mineral wool lining to DIN 4102, fire rating class A, faced with glass fibre fabric as a protection against erosion, effective with airflow velocities up to 20 m/s
  • Closed cell sealing strips

Construction

  • Powder-coated RAL 9005, black

Technical data

  • Width: 1590 mm SCHOOLAIR-B, 2090 mm SCHOOLAIR-B-HE
  • Height: 650 mm SCHOOLAIR-B, 750 mm SCHOOLAIR-B-HE
  • Depth: 420 mm
  • Volume flow rates: 150, 200, 250 m³/h (boost: 320 m³/h) with SCHOOLAIR-B
  • Volume flow rate: 150, 225, 300 m³/h (boost 400 m³/h) with SCHOOLAIR-B-HE
  • Cooling capacity: up to 1750 W
  • Heating capacity: up to 6500 W
  • Room cooling capacity: up to 1000 W
  • Room heating capacity: up to 1700 W
  • Sound power level: 32 – 49 dB(A) (depending on variant)
  • Max. operating pressure: 6 bar
  • Max. operating temperature: 75 °C
  • Supply voltage: 230 V AC ±10%; 50/60 Hz
  • Weight: 70 kg (SCHOOLAIR-B), 125 kg SCHOOLAIR-B-HE
  • Rating: 116 VA (SCHOOLAIR-B), 236 VA (SCHOOLAIR-B-HE)
  • Power consumption: 52 W (SCHOOLAIR-B) and 138 W (SCHOOLAIR-B-HE) with boost level; 38 W (SCHOOLAIR-B) or 75 W (SCHOOLAIR-B-HE) with medium speed (nominal volume flow rate)

Sizing data

Fresh air

  • V_________________[m³/h]

Supply air

  • V_________________[m³/h]

Room cooling capacity

  • Q_________________[W]

Room heating capacity

  • Q_________________[W]


  • LWA_______________[dB(A)]

00248396_0

 Type
SCHOOLAIR-B       Under sill unit

 Variant
       No entry: standard
HE       High heat recovery percentage

 Heat exchanger
2       2-pipe
4       4-pipe

 Condensate drip tray
       No entry: none
KM       with condensate drain

 Dimensions [mm]
       B × H × T
1590 × 650 × 420 (SCHOOLAIR-B)
2090 × 750 × 420 (SCHOOLAIR-B-HE)

 Control system
       No entry: none
R       With

  Control function
MA       Master (room module and control module)
SL       Slave (control module)

 Real time clock
       No entry: none
       master only
T       With

 Interface
       No entry: none
       master only
B       BACnet MS/TP or Modbus RTU
L       LonWorks LON-FTT10

 

 Air quality sensor
       No entry: none
       master only
V       VOC sensor

 Supply air temperature sensor
Z       With

 Fresh air temperature sensor
       No entry: none
       master only
A       With

 Heating valve
HV       With

 Lockshield – heating circuit
R       With

 kVS value – heating valve
0,25
0,40
0,63
1,00
F0,50

 Cooling valve
       For 4-pipe systems only
KV       with

 Lockshield – cooling circuit
R       With

 kVS value – cooling valve
0,25
0,40
0,63
1,00
F0,50

Decentralised ventilation units are technically advanced products of high quality; they offer a wide range of configuration options. For specification details regarding your project please contact your nearest TROX branch or subsidiary.

 

Variants, Dimensions and weight

  • Variants
  • Dimensions and weight

Installation examples, Installation details, Basic information and nomenclature

  • Installation examples
  • Installation details
  • Basic information and nomenclature

Installation and commissioning

  • Under sill installation standing on the floor
  • Level adjustment using the 4 levelling feet (+40 mm)
  • 2 mounting brackets at the side to screw-fix the unit to the wall
  • Fresh air and exhaust air connections are provided by two ventilation openings in the façade system or external wall (to be provided by others), preferably sloping towards the outside
  • Weather protection for the fresh air and exhaust air openings to be provided by others
  • Installation and connections to be performed by others; fixing, connection and sealing material to be provided by others
  • The water flow and return connections are on the right-hand side of the unit when seen from the room
  • Vents and drainage by others
  • The electrical connection is on the left-hand side of the unit when seen from the room
  • We recommend using flexible hoses to connect the unit to the pipework as they facilitate removing the heat exchanger for cleaning.
  • The under sill trim must not obstruct installation or deinstallation of the unit or maintenance access on the front of the unit

LN [mm]

Nominal length

LWA [dB(A)]

Sound power level

tPr [°C]

Primary air temperature

tWV [C°]

Water flow temperature – cooling/heating

tR [C°]

Room temperature

tR [C°]

Room temperature

tAN [C°]

Secondary air intake temperature

QPr [W]

Thermal output – primary air

Qtot [W]

Thermal output – total

QW [W]

Thermal output – water side, cooling/heating

VPr [l/s]

Primary air volume flow rate

VPr [m³/h]

Primary air volume flow rate

VW [l/h]

Water flow rate – cooling/heating

V [l/h]

Volume flow rate

∆tW [K]

Temperature difference – water

∆pW [kPa]

Pressure drop, water side

∆pt [Pa]

Total pressure drop, air side

∆tPr = tPr - tR [K]

Difference between primary air temperature and room temperature

∆tRWV = tWV - tR [K]

Difference between water flow temperature and room temperature

∆tWm-Ref [K]

Difference between mean water temperature and reference temperature

LN [mm]

Nominal length

Inducing displacement flow

The supply air is discharged near the external wall and with a medium velocity between 1.0 and 1.5 m/s. Due to the induction effect the supply air velocity is rapidly reduced such that, in cooling mode, the supply air displaces the room air over the entire floor area. The convection from people and other heat sources causes the fresh air from the pool to rise and create comfortable conditions in the occupied zone.

Heat exchanger

The maximum water-side operating pressure for all heat exchangers is 6 bar.

The maximum water flow temperature (heating circuit) for all heat exchangers is 75 °C; if flexible hoses are used, the water flow temperature should not exceed 55 °C. Units for other pressures and temperatures are available on request.

The water flow temperature (cooling circuit) should be at least 16 °C such that it does not permanently fall below the dew point. For units with a condensate drip tray the water flow temperature may be reduced to 15 °C.

Heat exchanger as 2-pipe system

Air-water systems with a 2-pipe heat exchanger may be used for either heating or cooling. In changeover mode it is possible to use all units within a water circuit exclusively for cooling in summer and exclusively for heating in winter.

Heat exchanger as 4-pipe system

Air-water systems with a 4-pipe heat exchanger may be used for both heating and cooling. Depending on the season, i.e. especially in spring and autumn, it may be possible that an office has to be heated in the morning and cooled in the afternoon.

References

Installation example SCHOOLAIR-B

slide_1
slide_2
slide_3

Share page

Recommend this page

Recommend this page by sending a link by mail.

Fields marked with an (*) are required fields.

Share page

Thank you for your recommendation!

Your recommendation has been sent and should arrive shortly.


Contact

We are here for you

Visual contact Visual contact

Please specify your message and type of request
Tel.: +49 (0)2845 / 202-0 | Fax: +49 (0)2845/202-265

Fields marked with an (*) are required fields.

Contact

Thank you for your message!

Visual contact Visual contact

Your message is send and will be processed shortly.
Our department for Service-Requests will contact you asap.
For general question regarding products or services you can also call:
Tel.: +49 (0)2845 / 202-0 | Fax: +49 (0)2845/202-265

Contact

We are here for you

Visual contact Visual contact

Please specify your message and type of request
Tel.: +49 (0)2845 / 202-0 | Fax: +49 (0)2845/202-265

Attachment (max. 10MB)

Fields marked with an (*) are required fields.

Contact

Thank you for your message!

Visual contact Visual contact

Your message is send and will be processed shortly.
Our department for Service-Requests will contact you asap.
For general question regarding products or services you can also call:
Tel.: +49 (0)2845 / 202-0 | Fax: +49 (0)2845/202-265